diff --git a/code/game/objects/structures/lattice.dm b/code/game/objects/structures/lattice.dm
index 96291ecd274..ec4652901d4 100644
--- a/code/game/objects/structures/lattice.dm
+++ b/code/game/objects/structures/lattice.dm
@@ -37,7 +37,7 @@
 	if(istype(loc, /turf/simulated/open))
 		var/turf/simulated/open/O = loc
 		spawn(1)
-			if(O) // If we built a new floor with the lattice, the open turf won't exist anymore.
+			if(istype(O)) // If we built a new floor with the lattice, the open turf won't exist anymore.
 				O.update() // This lattice may be supporting things on top of it.  If it's being deleted, they need to fall down.
 	..()